In the third treatise of my Logosophia, announced at the end of this volume, I shall give (Deo volente) the demonstrations and constructions of the Dynamic Philosophy scientifically arranged. It is, according to my conviction, no other than the system of Pythagoras and of Plato revived and purified from impure mixtures. Doctrina per tot manus tradita tandem in vappam desiit! The science of arithmetic furnishes instances, that a rule may be useful in practical application, and for the particular purpose may be sufficiently authenticated by the result, before it has itself been fully demonstrated. It is enough, if only it be rendered intelligible. This will, I trust, have been effected in the following Theses for those of my readers, who are willing to accompany me through the following chapter, in which the results will be applied to the deduction of the Imagination, and with it the principles of production and of genial criticism in the fine arts. THESIS I Truth is correlative to being. Knowledge without a correspondent reality is no knowledge; if we know, there must be somewhat known by us. To know is in its very essence a verb active. THESIS II All truth is either mediate, that is, derived from some other truth or truths; or immediate and original. The latter is absolute, and its formula A. A.; the former is of dependent or conditional certainty, and represented in the formula B. A. The certainty, which adheres in A, is attributable to B. SCHOLIUM. A chain without a staple, from which all the links derived their stability, or a series without a first, has been not inaptly allegorized, as a string of blind men, each holding the skirt of the man before him, reaching far out of sight, but all moving without the least deviation in one straight line. It would be naturally taken for granted, that there was a guide at the head of the file: what if it were answered, No! Sir, the men are without number, and infinite blindness supplies the place of sight? Equally inconceivable is a cycle of equal truths without a common and central principle, which prescribes to each its proper sphere in the system of science. That the absurdity does not so immediately strike us, that it does not seem equally unimaginable, is owing to a surreptitious act of the imagination, which, instinctively and without our noticing the same, not only fills up the intervening spaces, and contemplates the cycle (of B. C. D. E. F. etc.) as a continuous circle (A.) giving to all collectively the unity of their common orbit; but likewise supplies, by a sort of subintelligitur, the one central power, which renders the movement harmonious and cyclical. THESIS III